How severe is CVE-2025-1021?

CVE-2025-1021 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-1021 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-1021?

CVE-2025-1021 affects Synology Diskstation Manager. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-1021?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-1021 have an EU (EUVD) identifier?

Yes. CVE-2025-1021 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12254.

When was CVE-2025-1021 published?

CVE-2025-1021 was published on 2025-04-23 and last updated on 2026-06-17.

CVE-2025-1021

CVE-2025-1021 is a high-severity vulnerability in Synology Diskstation Manager with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-12254
Weakness: CWE-862
Affected product: Synology Diskstation Manager
Published: 2025-04-23
Last modified: 2026-06-17

Description

Missing authorization vulnerability in synocopy in Synology DiskStation Manager (DSM) before 7.1.1-42962-8, 7.2.1-69057-7 and 7.2.2-72806-3 allows remote attackers to read arbitrary files via unspecified vectors.

Frequently asked questions

What is CVE-2025-1021?: Missing authorization vulnerability in synocopy in Synology DiskStation Manager (DSM) before 7.1.1-42962-8, 7.2.1-69057-7 and 7.2.2-72806-3 allows remote attackers to read arbitrary files via unspecified vectors.
How severe is CVE-2025-1021?: CVE-2025-1021 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-1021 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-1021?: CVE-2025-1021 affects Synology Diskstation Manager. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-1021?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-1021 have an EU (EUVD) identifier?: Yes. CVE-2025-1021 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12254.
When was CVE-2025-1021 published?: CVE-2025-1021 was published on 2025-04-23 and last updated on 2026-06-17.

References

https://www.synology.com/en-global/security/advisory/Synology_SA_25_03

Affected products (1)

cpe:2.3:o:synology:diskstation_manager:*:*:*:*:*:*:*:*

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